* changed with_custom_field_error_proc to use ensure for restoring default field_error_proc and to store it in a local variable instead of in a class variable (nested calls were problematic due to the globalness of class variables)
* changed with_custom_field_error_proc to use ensure for restoring default field_error_proc and to store it in a local variable instead of in a class variable (nested calls were problematic due to the globalness of class variables)

ryanfox1985/formtastic,Davidzhu001/formtastic,mikz/formtastic,Davidzhu001/formtastic,Baltazore/formtastic,ConferenceCloud/formtastic,justinfrench/formtastic,sideci-sample/sideci-sample-formtastic,justinfrench/formtastic,thenthen8515/formtastic,ryanfox1985/formtastic,EndingChaung/formtastic,Guestfolio/formtastic,nishaya/formtastic,thenthen8515/formtastic,EndingChaung/formtastic,paulodiovani/formtastic,nishaya/formtastic,ryanfox1985/formtastic,justinfrench/formtastic,ConferenceCloud/formtastic,paulodiovani/formtastic,pcreux/formtastic,mikz/formtastic,crashlytics/formtastic,Guestfolio/formtastic